﻿using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Collections.Generic;
using System.IO;
using System.Linq;

namespace Cinser.Common.Silverlight
{
    public class ExcelHelper
    {
        #region 导出DataGrid数据到Excel

        /// <summary>
        /// CSV格式化
        /// </summary>
        /// <param name="data">数据</param>
        /// <returns>格式化数据</returns>
        private static string FormatCsvField(string data)
        {
            return String.Format("\"{0}\"", data.Replace("\"", "\"\"\"").Replace("\n", "").Replace("\r", ""));
        }

        /// <summary>
        /// 导出DataGrid数据到Excel
        /// </summary>
        /// <param name="withHeaders">是否需要表头</param>
        /// <param name="grid">DataGrid</param>
        /// <returns>Excel内容字符串</returns>
        public static string ExportDataGrid(bool withHeaders, DataGrid grid)
        {
            System.Reflection.PropertyInfo propInfo;
            System.Windows.Data.Binding binding;
            var strBuilder = new System.Text.StringBuilder();
            var source = (grid.ItemsSource as System.Collections.IList);
            if (source == null) return "";
            var headers = new List<string>();
            grid.Columns.ToList().ForEach(col =>
            {
                if (col is DataGridBoundColumn)
                { headers.Add(FormatCsvField(col.Header.ToString())); }
            });
            strBuilder.Append(String.Join(",", headers.ToArray())).Append("\r\n");
            foreach (Object data in source)
            {
                var csvRow = new List<string>();
                foreach (DataGridColumn col in grid.Columns)
                {
                    if (col is DataGridBoundColumn)
                    {
                        binding = (col as DataGridBoundColumn).Binding;
                        string colPath = binding.Path.Path;
                        propInfo = data.GetType().GetProperty(colPath);
                        if (propInfo != null)
                        {
                            csvRow.Add(FormatCsvField(propInfo.GetValue(data, null).ToString()));
                        }
                    }
                }
                strBuilder.Append(String.Join(",", csvRow.ToArray())).Append("\r\n");
            }
            return strBuilder.ToString();
        }


        /// <summary>
        /// 导出DataGrid数据到Excel
        /// </summary>
        /// <param name="withHeaders">是否需要表头</param>
        /// <param name="grid">DataGrid</param>
        /// <returns>Excel内容字符串</returns>
        public static string ExportDataGrid(bool withHeaders,  DT.DMPDataTable dt)
        {
            var strBuilder = new System.Text.StringBuilder();
            var headers = new List<string>();
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                headers.Add(dt.Columns[i].ColumnName);
            }

            strBuilder.Append(String.Join(",", headers.ToArray())).Append("\r\n");
            
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                var csvRow = new List<string>();
                foreach (string  colHeaderName in headers)
                {
                    csvRow.Add(FormatCsvField(dt.Rows[i][colHeaderName].ToString()));
                }
                strBuilder.Append(String.Join(",", csvRow.ToArray())).Append("\r\n");
            }

            return strBuilder.ToString();
        }

        /// <summary>
        /// 导出DataGrid数据到Excel
        /// </summary>
        /// <param name="withHeaders">是否需要表头</param>
        /// <param name="grid">DataGrid</param>
        /// <param name="dataBind"></param>
        /// <returns>Excel内容字符串</returns>
        public static string ExportDataGrid(bool withHeaders, DataGrid grid, bool dataBind)
        {
            var strBuilder = new System.Text.StringBuilder();
            var source = (grid.ItemsSource as System.Collections.IList);
            if (source == null) return "";
            var headers = new List<string>();
            grid.Columns.ToList().ForEach(col =>
            {
                if (col is DataGridTemplateColumn)
                {
                    headers.Add(col.Header != null ? FormatCsvField(col.Header.ToString()) : string.Empty);
                }
            });
            strBuilder.Append(String.Join(",", headers.ToArray())).Append("\r\n");
            foreach (Object data in source)
            {
                var csvRow = new List<string>();
                foreach (DataGridColumn col in grid.Columns)
                {
                    if (col is DataGridTemplateColumn)
                    {
                        FrameworkElement cellContent = col.GetCellContent(data);
                        TextBlock block;
                        if (cellContent.GetType() == typeof(Grid))
                        {
                            block = cellContent.FindName("TempTextblock") as TextBlock;
                        }
                        else
                        {
                            block = cellContent as TextBlock;
                        }
                        if (block != null)
                        {
                            csvRow.Add(FormatCsvField(block.Text));
                        }
                    }
                }
                strBuilder.Append(String.Join(",", csvRow.ToArray())).Append("\r\n");
                //strBuilder.Append(String.Join(",", csvRow.ToArray())).Append("\t");
            }
            return strBuilder.ToString();
        }
        /// <summary>
        /// 导出DataGrid数据到Excel为CVS文件
        /// 使用utf8编码 中文是乱码 改用Unicode编码
        /// 
        /// </summary>
        /// <param name="withHeaders">是否带列头</param>
        /// <param name="grid">DataGrid</param>
        public static void ExportDataGridSaveAs(bool withHeaders, DataGrid grid)
        {
            string data = ExportDataGrid(true, grid);
            ExportExcelSaveAs(data);
        }

        public static void ExportExcelSaveAs(string data)
        {
            var sfd = new SaveFileDialog
            {
                DefaultExt = "csv",
                Filter = "CSV Files (*.csv)|*.csv|All files (*.*)|*.*",
                FilterIndex = 1
            };
            if (sfd.ShowDialog() == true)
            {
                using (Stream stream = sfd.OpenFile())
                {
                    using (var writer = new StreamWriter(stream, System.Text.Encoding.Unicode))
                    {
                        data = data.Replace(",", "\t");
                        writer.Write(data);
                        writer.Close();
                    }
                    stream.Close();
                }
            }
        }

        #endregion 导出DataGrid数据到Excel

    }
}
